Pat Mayse Lake: 98.1% full as of 2026-08-14
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Today | 2026-08-14 | 98.1 | 450.61 | 115,653 | 111,493 | 113,683 | 5,596 |
| Yesterday | 2026-08-13 | 98.3 | 450.65 | 115,877 | 111,717 | 113,683 | 5,600 |
| 2 days ago | 2026-08-12 | 98.5 | 450.69 | 116,101 | 111,941 | 113,683 | 5,604 |
| 1 week ago | 2026-08-07 | 99.3 | 450.85 | 116,999 | 112,839 | 113,683 | 5,622 |
| 1 month ago | 2026-07-14 | 100.0 | 452.13 | 124,283 | 113,683 | 113,683 | - n.a. - |
| 3 months ago | 2026-05-14 | 91.4 | 449.23 | 108,046 | 103,886 | 113,683 | 5,367 |
| 6 months ago | 2026-02-14 | 87.5 | 448.39 | 103,587 | 99,427 | 113,683 | 5,253 |
| 1 year ago | 2025-08-14 | 100.0 | 451.00 | 117,844 | 113,683 | 113,683 | 5,638 |
*
Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.
**
Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.
Most Recent Instantaneous Water Level
| Date/time |
Water Level (ft) |
Conservation Pool Elevation (ft) |
Height Above Conservation Pool (ft) |
|
|---|---|---|---|---|
| Most recent | 2026-08-14 11:00 | 450.60 | 451.00 | -0.40 |
| 1 hour prior | 2026-08-14 10:00 | 450.61 | 451.00 | -0.39 |
| 2 hours prior | 2026-08-14 09:00 | 450.60 | 451.00 | -0.40 |
| 6 hours prior | 2026-08-14 05:00 | 450.61 | 451.00 | -0.39 |
| 12 hours prior | 2026-08-13 23:00 | 450.62 | 451.00 | -0.38 |
| 24 hours prior | 2026-08-13 11:00 | 450.66 | 451.00 | -0.34 |
| 48 hours prior | 2026-08-12 11:00 | 450.70 | 451.00 | -0.30 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1967-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 415.00 ft above NGVD29 |
| Service spillway crest elevation | 451.00 ft above NGVD29 |
| Emergency spillway crest elevation | 477.00 ft above NGVD29 |
| Flood pool elevation | 460.50 ft above NGVD29 |
| Top of dam elevation | 488.50 ft above NGVD29 |
| Conservation pool elevation | 451.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
| Data Source | USACE:MYST2 |
Lake Location
